Santa and his reindeer will be visible between 5.22pm and 5.27pm.
To the naked eye, Santa’s sleigh will appear like a fast moving bright light as it tracks from the southwest to the southeast over Ireland on a similar path as the International Space Station.
The sleigh will be the brightest object in the sky, outshining even the brightest star in the sky by a factor of 10 to 100 times.
On board the 400 tonne sleigh will be millions of presents that Santa will be delivering to boys and girls all over the world.
One of Santa’s elves told The Clare Herald: “This will be a rather rare and very exciting opportunity for the boys and girls of Ireland to get a sneaky glimpse of Santa before he touches down in Ireland in the early hours of Christmas morning.”
“However, Santa has said that children must be tucked up in their beds by the time he makes his second approach over Ireland shortly after midnight as this will signal the start of deliveries there.
“Don’t forget to wave up at Santa when you see him!,” the Elf added.
Met Éireann says that Christmas Eve (Wednesday) will be mainly dry and clear with good viewing opportunities. Some sunshine will develop for most places but Atlantic showers will affect coasts, dying out before making any progress inland. It will be a noticeably colder day though with a moderate westerly wind, decreasing light later. Temperatures in the afternoon will be between about 5 and 8 degrees generally, and it will become very cold and frosty overnight with temperatures down below freezing for most places.
Meanwhile, the International Space Station can also be seen at a different times every evening from now until December 28th. For viewing times and where to look in the sky visit http://www.isstracker.com or http://www.astronomy.ie.